A low-power standard-compliant NB-IoT wake-up receiver (WRX) is presented. The WRX is designed as a companion radio to a full NB-IoT receiver, only operating during discontinuous RX modes (DRX and eDRX), which allows the full high-power radio to turn off while the wake-up receiver efficiently receives NB-IoTWake-Up Signals (WUS). The fabricated receiver achieves 2.1 mW power at −109 dBm sensitivity with 180 kHz bandwidth over the 750-960 MHz bands. The WRX is fabricated in 28 nm CMOS and consumes 5× less power than the best previously published traditional NB-IoT receivers. This disclosure is the first designed dedicated wake-up receiver for the NB-IoT protocol and demonstrates the benefits of utilizing a WRX to reduce power consumption of NB-IoT radios.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The wake-up circuit of claim 1 further includes a frequency locked loop circuit interfaced with the local oscillator, where the frequency locked loop circuit is enabled and the fractional n phased-locked loop circuit is disabled in response to the wake-up receiver being powered on.
3. The wake-up receiver of claim 1 wherein, after the wake-up received has been powered on for a period of time, the frequency locked loop circuit is disabled and the fractional n phased-locked loop circuit is enabled.
4. The wake-up receiver of claim 1 wherein the low noise amplifier has a current-reuse circuit arrangement.
5. The wake-up received of claim 4 wherein the low noise amplifier includes a transformer with a coupling factor of one.
6. The wake-up receiver of claim 1 operates in accordance with Narrowband IoT standard.
7. The wake-up receiver of claim 1 further comprises an inductor electrically coupled to the local oscillator, where the local oscillator resides on a chip and the inductor resides off the chip.
9. The wake-up circuit of claim 8 wherein the frequency locked loop circuit is enabled and the fractional n phased-locked loop circuit is disabled in response to the wake-up receiver being powered on.
10. The wake-up receiver of claim 9 wherein, after the wake-up received has been powered on for a period of time, the frequency locked loop circuit is disabled and the fractional n phased-locked loop circuit is enabled.
11. The wake-up receiver of claim 8 wherein the low noise amplifier has a current-reuse circuit arrangement.
12. The wake-up received of claim 11 wherein the low noise amplifier includes a transformer with a coupling factor of one.
13. The wake-up receiver of claim 8 operates in accordance with Narrowband IoT standard.
14. The wake-up receiver of claim 8 further comprises an inductor electrically coupled to the local oscillator, where the local oscillator resides on a chip and the inductor resides off the chip.
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March 30, 2022
September 10, 2024
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